Selamat Datang di Situs WEAP
WEAP adalah sebuah insiatif dari Stockholm Environment Institute.

Tentang WEAP

Mengapa WEAP ?
Apa yang Baru ?
Contoh Screen
Contoh Demo
Sejarah dan Kredit

Menggunakan WEAP
Bantuan Penggunaan

Forum Pengguna
Daftar Anggota
Sunting Profil

Penunjang Tambahan
Program Universitas

Tentang Kami
SEI-US Program Sumberdaya Perairan
Silahkan Hubungi Kami

 Berita Lingkungan
LEAP Tertarik pada Energi?
Baca tentang LEAP: Software SEI untuk perencanaan energi

Forum Pengguna

Seluruh Topik | Topik "Runoff Resistance Factor (RRF) and Manning's N"
Masuk untuk mengirim pesan baru atau membalas pesan yang ada.
Penulis Pesan
Patrick Keys

Subjek: Runoff Resistance Factor (RRF) and Manning's N   
Dikirim: 4/6/2010 Dilihat: 18690 times

Does anyone know of a relationship between the Runoff Resistance Factor (RRF) and the surface roughness coefficient, Manning's N? I am trying to estimate the RRF of a landcover dataset, and it would be handy to have a conversion factor or coefficient by which to multiply standardized roughness values to find RRF.

If not, maybe this is a niche for some research?

Glenn Moeller

Subjek: Re: Runoff Resistance Factor (RRF) and Manning's N   
Dikirim: 4/19/2010 Dilihat: 18623 times
Hi Patrick,

RRF (formerly Leaf Area Index, LAI) is more akin to C in the rational formula than to Manning's N. Increasing RRF causes a decrease in surface runoff (since Z1 is less than 1 and surface runoff of proportional to Z1 raised to the RRF) with a consequent increase in Z1. This of course leads to higher interflow, Z2 (or flow to GW), baseflow, and ET. I'm not sure how you're trying to use N in WEAP, but I do not believe this is the way to do it. I'm not actually sure it can be done at all.

Hope this helps,
Gonzalo Cortes

Subjek: Re: Runoff Resistance Factor (RRF) and Manning's N   
Dikirim: 5/5/2010 Dilihat: 18572 times
Hi Patrick, I think it should be a mistake associating N in any way with WEAP. Manning's n is more of an "hydraulic" property of a channel, and it should be considered only if you're interested in properties of the water flow inside the channel, such as speed and height of the flow. As WEAP21 doesn't compute or use this values, Manning's N should be of no importance in our data.

Topik "Runoff Resistance Factor (RRF) and Manning's N"